Mosquito season in Anderson County, KS: when it starts and ends

Mosquito months in Anderson County

In a normal year mosquito season in Anderson County, KS starts around April 6 and ends around November 1, about 30 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Anderson County, and when

• Start tipping out standing water weekly by March 23.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after November 1.
• No West Nile cases since 2016, so bites in Anderson County are a nuisance; check window screens.

Anderson County against the rest of KS

Anderson County has the 32nd longest season of 105 KS counties, at 209 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 55.3°F.

• Shawnee County: April 5 to October 31 (209 days, 12 WNV)
• Wyandotte County: April 5 to October 31 (209 days, 5 WNV)
• McPherson County: April 6 to November 1 (209 days, 5 WNV)
• Douglas County: April 5 to October 30 (208 days, 7 WNV)

West Nile in Anderson County

CDC ArboNET lists no human West Nile cases for Anderson County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.

See how the dates are worked out, and when mosquitoes go away for the winter.